Posted by David G on May 07, 2016 at 06:56:34 from (97.127.189.97):
I got burned out this winter, so no work on it, but getting back to it soon.
Here are my ideas:
I put in a strictly centrifugal advance table, plan to make that a combination of centrifugal and vacuum. I would like to get an advance curve from a high compression 44 or Farmall M, and use that as my high load base, then add a couple of degrees of advance under low load. I also need to check the dwell settings against the desired ones for the coil I installed so that is optimum. If anyone has that curve, I would appreciate you sending it to me.
The computer has a setting for injector delay, I put that in as 1ms. I have been researching this and it should really be between .8 and .9 ms, and found a procedure where I can determine this by changing it and looking at the AFR, so plan to do that. This setting will show up in the linearity of the fuel settings as I go from low to high load. The tractor does not blow smoke, but the inside of the exhaust is sooty, which I think is wrong. I can set the AFR table to match the load curve, then tune to it. I made that table a little rich when setting it up so that I did not burn up any pistons. The table should go from about 14.7 at no load to 12.5 - 13.5 at full load, so will look at that. I have it going to 12.5 pretty quick, would like to move that up to and see how HP varies and exhaust pipe looks. The autotune uses this curve to adjust the fuel settings.
The engine uses a siamese manifold, so the inner cylinders are always going to run richer. I added EGT sensors this winter, so will look at how that is right now, and see if it is worth messing with. I can vary the injector timing, or go to dual injectors if necessary.
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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